I stumbled upon the same error around version 72.0.3815.186. When I test it on current 72.0.3815.211, the problem seems to occur from time to time. I use Windows 10.
It seems when I try to write in something that isn't yet in the histotry, or is not on suggested list, then I can't search it - hitting Enter doesn't do anything.
The problem started a few days ago (2-5? - don't remember exactly), so the bug had to slip through then.